Diana Lamplugh is seeking a successor as chief executive of the charity she founded 17 years ago following the disappearance of her daughter, Suzy.
The Suzy Lamplugh Trust was established in 1986 in memory of the young estate agent who vanished while showing a client around a house.
Originally founded to promote safety at work, the charity, which has 18 staff, now encompasses all aspects of personal safety.
Diana Lamplugh, who was awarded an OBE for her campaign to promote safer living, decided to look for a new chief executive after suffering a stroke in March.
"It's not uncommon for a parent to set up a trust after their child dies, but it is unusual for one to survive so long," said spokesperson Jo Walker.